From the aspect of use:
The lessor of the dynamic compaction machine reminded that the hydraulic impact compaction is a professional compaction equipment that has been widely used in engineering construction in recent years. It is composed of a bearing mechanism, a compaction frame, a compaction hammer, a lower hammer head, a buffer device, a hydraulic system, an electronic control system, etc. by directly installing it on the loader, excavator and other engineering machinery, it directly borrows the hydraulic power output of the excavator, loader and other machinery, and does not need to be equipped with other power sources.
From the characteristics of construction method:
The hydraulic impact rammer uses the principle of dynamic compaction technology and is specially designed to tamp the foundation at a specific depth. It has fast mobility. The drop height of the hammer can reach 1.2m, and it can be tamped more than 40 times per minute. The hammer is divided into different models according to the weight of the hammer. The energy of each compaction is different, and the height can reach 108kn m. The depth of influence is 1 to 10 meters. The tamping energy is transmitted to the foundation through the lower hammer head directly placed on the ground, which avoids the risk of stone splashing and heavy hammer falling during the operation of traditional dynamic compaction equipment.
In terms of working principle:
The compaction method of hydraulic impact rammer for soil mass can be called "dynamic compaction method" for short. Power means dynamic force, variable force. Dynamic compaction technology is a new technology which is different from static compaction, vibration compaction, impact compaction, compaction and other traditional compaction technologies. Dynamic compaction is to apply greater dynamic force to improve the compaction effect on the basis of static (gravity) compaction; Vibratory compaction is the use of vibration effect to enhance the effect of static compaction;
From the aspect of compaction:
The lessor of dynamic compaction machine thinks that impact compaction is high-frequency alternating compaction and variable force (the resultant force of static force and variable force is still variable force) rolling; Tamping is a typical feature of large impact and fast attenuation when the hammer directly hits the ground at a high speed. Dynamic compaction is a compaction method between impact compaction and variable force compaction and compaction.
Both dynamic compaction and impact compaction use the resultant force of variable force and gravity to compress the soil, but the ratio of variable force to gravity is quite large in the former and relatively small in the latter. Both dynamic compaction and compaction have impact, but the former accelerates from the static state, and the peak value of impact force is much smaller but lasts a long time, while the latter impacts the ground at a high speed, and the peak value of impact force is much larger but decays quickly.
If the compaction method is used to reinforce and roll the abutment back up to the standard, the strong shear of the hammer on the soil will destroy the soil structure; While the front face of the hammer compresses the soil at a high speed, it also compresses the soil at a high speed to the periphery, resulting in strong shear wave and large destructive force.
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